I ran go get package to download a package before learning that I needed to set my GOPATH otherwise that package sullies my root Go install (I woul
go get package
GOPATH
It's safe to just delete the source directory and compiled package file. Find the source directory under $GOPATH/src and the package file under $GOPATH/pkg/, for example: $GOPATH/pkg/windows_amd64.
$GOPATH/src
$GOPATH/pkg/
$GOPATH/pkg/windows_amd64